48 lines
1.6 KiB
HTML
48 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="./resources/intersection-observer-test-utils.js"></script>
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<style>
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#scroller { width: 100px; height: 100px; overflow: hidden; background-color: gray; }
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#spacer { width: 50px; height: 120px; }
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#target { width: 50px; height: 50px; background-color: green; }
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</style>
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<div id=scroller>
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<div id=spacer></div>
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<div id=target></div>
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</div>
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<script>
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let entries = [];
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window.onload = function() {
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runTestCycle(testNoInitialIntersection, "Test no initial scroll margin intersection");
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const observer = new IntersectionObserver(
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es => entries = entries.concat(es),
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{
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scrollMargin: "10px"
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}
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);
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observer.observe(target);
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};
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function testNoInitialIntersection() {
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assert_equals(entries.length, 1, "IntersectionObserverEntryCount");
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assert_false(entries[0].isIntersecting, "isIntersectingInitial");
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assert_approx_equals(entries[0].intersectionRatio, 0.0, 0.001, "intersectionRatioInitial");
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scroller.scrollTop = 20;
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runTestCycle(testIntersectionAfterScroll, "Test scroll margin intersection after scrolling");
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}
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function testIntersectionAfterScroll() {
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assert_equals(entries.length, 2, "IntersectionObserverEntryCount");
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assert_true(entries[1].isIntersecting, "isIntersecting");
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assert_approx_equals(entries[1].intersectionRatio, 0.2, 0.001, "intersectionRatio");
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}
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</script>
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